Background/Objective

Depressive disorders have a high prevalence around the world. They present a great comorbidity with other disorders like anxiety, thereby making a differential diagnosis very difficult. The Basic Depression Questionnaire was designed to palliate this issue by isolating specific depression symptoms. Our aim is to study the reliability, factorial structure, and differential item functioning of this questionnaire. Method: The sample consisted of 1,397 adults without psychological problems (M_age = 29.76, SD = 11.25, 64.78% women) who completed the CBD. Results: We observed that none of the items presented differential functioning. A monofactorial structure was established. In this model a good fit was obtained by confirmatory factor analysis and a strict invariance by sex. The ordinal alpha was used to check the reliability and it fetched an index of .95. Conclusions: The Basic Depression Questionnaire has adequate psychometric properties. The absence of differential item functioning and the invariance by sex are guarantees of an adequate use to diagnose depression for men and women. So, its clinical use can help to differentiate between the specific diagnoses for depressive disorders and anxiety disorders.

中文翻译：

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基本抑郁问卷的信度和效度

背景/目标

抑郁症在世界范围内普遍流行。他们与其他疾病（如焦虑症）并存很大，因此很难进行鉴别诊断。基本抑郁问卷旨在通过隔离特定的抑郁症状来缓解这一问题。我们的目的是研究此问卷的可靠性，阶乘结构和差异项功能。方法：本样本由1,397名没有心理问题的成年人组成（M_年龄 = 29.76，SD = 11.25，占64.78％的女性）。结果：我们观察到没有一项表现出差异功能。建立了单因素结构。在该模型中，通过验证性因素分析获得了很好的拟合，并且严格按性别不变。序号alpha用于检查可靠性，并获取了0.95的索引。结论：基本抑郁问卷具有足够的心理计量学特性。缺少差异项功能和性别不变性保证了可以充分用于诊断男性和女性的抑郁症。因此，其临床用途可以帮助区分抑郁症和焦虑症的具体诊断。